ip/iplink_ipvlan.c

   1 /* iplink_ipvlan.c      IPVLAN device support
   2  *
   3  *              This program is free software; you can redistribute it and/or
   4  *              modify it under the terms of the GNU General Public License
   5  *              as published by the Free Software Foundation; either version
   6  *              2 of the License, or (at your option) any later version.
   7  *
   8  * Authors:     Mahesh Bandewar <maheshb@google.com>
   9  */
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/socket.h>
  15 #include <linux/if_link.h>
  16
  17 #include "rt_names.h"
  18 #include "utils.h"
  19 #include "ip_common.h"
  20
  21 static void ipvlan_explain(FILE *f)
  22 {
  23         fprintf(f, "Usage: ... ipvlan [ mode { l2 | l3  | l3s } ]\n");
  24 }
  25
  26 static int ipvlan_parse_opt(struct link_util *lu, int argc, char **argv,
  27                             struct nlmsghdr *n)
  28 {
  29         while (argc > 0) {
  30                 if (matches(*argv, "mode") == 0) {
  31                         __u16 mode = 0;
  32
  33                         NEXT_ARG();
  34
  35                         if (strcmp(*argv, "l2") == 0)
  36                                 mode = IPVLAN_MODE_L2;
  37                         else if (strcmp(*argv, "l3") == 0)
  38                                 mode = IPVLAN_MODE_L3;
  39                         else if (strcmp(*argv, "l3s") == 0)
  40                                 mode = IPVLAN_MODE_L3S;
  41                         else {
  42                                 fprintf(stderr, "Error: argument of \"mode\" must be either \"l2\", \"l3\" or \"l3s\"\n");
  43                                 return -1;
  44                         }
  45                         addattr16(n, 1024, IFLA_IPVLAN_MODE, mode);
  46                 } else if (matches(*argv, "help") == 0) {
  47                         ipvlan_explain(stderr);
  48                         return -1;
  49                 } else {
  50                         fprintf(stderr, "ipvlan: unknown option \"%s\"?\n",
  51                                 *argv);
  52                         ipvlan_explain(stderr);
  53                         return -1;
  54                 }
  55                 argc--;
  56                 argv++;
  57         }
  58
  59         return 0;
  60 }
  61
  62 static void ipvlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
  63 {
  64
  65         if (!tb)
  66                 return;
  67
  68         if (tb[IFLA_IPVLAN_MODE]) {
  69                 if (RTA_PAYLOAD(tb[IFLA_IPVLAN_MODE]) == sizeof(__u16)) {
  70                         __u16 mode = rta_getattr_u16(tb[IFLA_IPVLAN_MODE]);
  71
  72                         fprintf(f, " mode %s ",
  73                                 mode == IPVLAN_MODE_L2 ? "l2" :
  74                                 mode == IPVLAN_MODE_L3 ? "l3" :
  75                                 mode == IPVLAN_MODE_L3S ? "l3s" : "unknown");
  76                 }
  77         }
  78 }
  79
  80 static void ipvlan_print_help(struct link_util *lu, int argc, char **argv,
  81                               FILE *f)
  82 {
  83         ipvlan_explain(f);
  84 }
  85
  86 struct link_util ipvlan_link_util = {
  87         .id             = "ipvlan",
  88         .maxattr        = IFLA_IPVLAN_MAX,
  89         .parse_opt      = ipvlan_parse_opt,
  90         .print_opt      = ipvlan_print_opt,
  91         .print_help     = ipvlan_print_help,
  92 };